Best way?

Now, my car has been lowered 40mm and the rear looks fine (not quite low enough for my liking, but hey, that will come over time), the fronts still look like gaping chasms with 15's so if I wanted to drop it more I think this would be amplified even more. has anyone got any thoughts on making the gap look smaller (without going for stupid ghey big rims? 16's at the most for me all the time).